package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.SetmealDTO;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;


@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能查询  自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //判断当前购物车的商品是否已经存在
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        //如果商品已经存在 且 数量大于 1

        if (shoppingCartList != null && shoppingCartList.size() > 0) {

            //如果存在则将商品数量+1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }
        else {
            //如果不存在则直接添加商品
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
                //如果存在则将商品数量+1
            } else {
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }

    }


    /**
     * 根据用户id查询购物车
     *
     * @return
     */
    public List<ShoppingCart> listShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart.builder().userId(BaseContext.getCurrentId()).build());
    }

    /**
     * 根据用户id删除购物车商品
     *
     * @param shoppingCartDTO
     */
    public void deleteShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能删除userid 自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList != null && shoppingCartList.size() > 0) {
            shoppingCart = shoppingCartList.get(0);
            Integer number = shoppingCart.getNumber();
            if (number == 1){
                //如果数量为1 则直接删除
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //如果数量大于1 则将商品数量-1
                shoppingCart.setNumber(number - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }

        }
    }


    public void cleanShoppingCart() {
        Long user_id = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(user_id);
    }
}
